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Cell Phones: Partial Findings Report

NTP has conducted studies on potential health hazards from cell phone radiofrequency radiation in rats and mice. On May 27, 2016, NTP released partial findings in a report titled “Report of Partial Findings from the National Toxicology Program Carcinogenesis Studies of Cell Phone Radiofrequency Radiation in Hsd: Sprague Dawley SD Rats (Whole Body Exposure)”. The complete findings from all of the rat and mouse studies have been released as draft reports and were reviewed by an external expert panel in March 2018. The final NTP reports are expected in fall 2018.

The partial findings in the May 2016 report were peer reviewed by experts selected by NTP and the National Institutes of Health. These reviews and responses to comments are included as appendices to the partial findings report, and have been incorporated into the final report from the rat studies.

Key points:

  • NTP reported low incidences of tumors in the brains and hearts of male rats, but not in female rats, in these partial findings.
  • For the studies, rats were exposed to 2G and 3G frequencies and modulations still used in voice calls and texting in the United States. Specifically, the rats were exposed for 10-minute on, 10-minute off increments, totaling just over 9 hours a day from before birth through 2 years of age.
  • These are the largest, most complex studies ever conducted by NTP.
  • The U.S. Food and Drug Administration nominated cell phone radiofrequency radiation for NTP study.
  • NTP has shared these findings with its federal regulatory partners so they have the latest information.

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